I don’t think having a black president has much of anything to do with the militias reforming. Mostly it is the implicit threat to gun rights. It tracks right along with the acceleration of gun and ammo sales and is very similar to the same phenomenon in 1992-94 when, as today, there was a threat of gun confiscation from the party in control of the presidency and Congress. In the early 90s the threat was more explicit but memory of the time helps fuel the militias now.Waco and Weaver spurred the militias then and that, too, is remembered. More Wacos are feared now. The militia phenomenon dissipated after that great sigh of national relief that followed the 1994 elections.
Fox News is going ape about it right now.